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![Ramkumar Ramachandra](/assets/img/avatar_default.png)
Currently, diffcore-pickaxe reports two distinct errors for the same user error: $ git log --pickaxe-regex -S'\1' fatal: invalid pickaxe regex: Invalid back reference $ git log -G'\1' fatal: invalid log-grep regex: Invalid back reference This "log-grep" was only an internal name for the -G feature during development, and invite confusion with "git log --grep=<pattern>". Change the error messages to say "invalid regex". Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
276 lines
6.5 KiB
C
276 lines
6.5 KiB
C
/*
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* Copyright (C) 2005 Junio C Hamano
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* Copyright (C) 2010 Google Inc.
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*/
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#include "cache.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "xdiff-interface.h"
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#include "kwset.h"
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typedef int (*pickaxe_fn)(mmfile_t *one, mmfile_t *two,
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struct diff_options *o,
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regex_t *regexp, kwset_t kws);
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static int pickaxe_match(struct diff_filepair *p, struct diff_options *o,
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regex_t *regexp, kwset_t kws, pickaxe_fn fn);
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static void pickaxe(struct diff_queue_struct *q, struct diff_options *o,
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regex_t *regexp, kwset_t kws, pickaxe_fn fn)
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{
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int i;
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struct diff_queue_struct outq;
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DIFF_QUEUE_CLEAR(&outq);
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if (o->pickaxe_opts & DIFF_PICKAXE_ALL) {
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/* Showing the whole changeset if needle exists */
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for (i = 0; i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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if (pickaxe_match(p, o, regexp, kws, fn))
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return; /* do not munge the queue */
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}
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/*
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* Otherwise we will clear the whole queue by copying
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* the empty outq at the end of this function, but
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* first clear the current entries in the queue.
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*/
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for (i = 0; i < q->nr; i++)
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diff_free_filepair(q->queue[i]);
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} else {
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/* Showing only the filepairs that has the needle */
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for (i = 0; i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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if (pickaxe_match(p, o, regexp, kws, fn))
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diff_q(&outq, p);
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else
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diff_free_filepair(p);
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}
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}
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free(q->queue);
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*q = outq;
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}
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struct diffgrep_cb {
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regex_t *regexp;
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int hit;
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};
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static void diffgrep_consume(void *priv, char *line, unsigned long len)
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{
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struct diffgrep_cb *data = priv;
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regmatch_t regmatch;
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int hold;
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if (line[0] != '+' && line[0] != '-')
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return;
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if (data->hit)
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/*
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* NEEDSWORK: we should have a way to terminate the
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* caller early.
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*/
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return;
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/* Yuck -- line ought to be "const char *"! */
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hold = line[len];
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line[len] = '\0';
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data->hit = !regexec(data->regexp, line + 1, 1, ®match, 0);
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line[len] = hold;
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}
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static int diff_grep(mmfile_t *one, mmfile_t *two,
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struct diff_options *o,
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regex_t *regexp, kwset_t kws)
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{
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regmatch_t regmatch;
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struct diffgrep_cb ecbdata;
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xpparam_t xpp;
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xdemitconf_t xecfg;
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if (!one)
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return !regexec(regexp, two->ptr, 1, ®match, 0);
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if (!two)
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return !regexec(regexp, one->ptr, 1, ®match, 0);
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/*
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* We have both sides; need to run textual diff and see if
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* the pattern appears on added/deleted lines.
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*/
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memset(&xpp, 0, sizeof(xpp));
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memset(&xecfg, 0, sizeof(xecfg));
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ecbdata.regexp = regexp;
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ecbdata.hit = 0;
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xecfg.ctxlen = o->context;
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xecfg.interhunkctxlen = o->interhunkcontext;
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xdi_diff_outf(one, two, diffgrep_consume, &ecbdata,
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&xpp, &xecfg);
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return ecbdata.hit;
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}
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static void diffcore_pickaxe_grep(struct diff_options *o)
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{
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int err;
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regex_t regex;
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int cflags = REG_EXTENDED | REG_NEWLINE;
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if (DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE))
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cflags |= REG_ICASE;
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err = regcomp(®ex, o->pickaxe, cflags);
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if (err) {
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char errbuf[1024];
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regerror(err, ®ex, errbuf, 1024);
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regfree(®ex);
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die("invalid regex: %s", errbuf);
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}
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pickaxe(&diff_queued_diff, o, ®ex, NULL, diff_grep);
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regfree(®ex);
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return;
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}
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static unsigned int contains(mmfile_t *mf, struct diff_options *o,
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regex_t *regexp, kwset_t kws)
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{
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unsigned int cnt;
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unsigned long sz;
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const char *data;
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sz = mf->size;
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data = mf->ptr;
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cnt = 0;
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if (regexp) {
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regmatch_t regmatch;
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int flags = 0;
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assert(data[sz] == '\0');
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while (*data && !regexec(regexp, data, 1, ®match, flags)) {
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flags |= REG_NOTBOL;
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data += regmatch.rm_eo;
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if (*data && regmatch.rm_so == regmatch.rm_eo)
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data++;
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cnt++;
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}
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} else { /* Classic exact string match */
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while (sz) {
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struct kwsmatch kwsm;
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size_t offset = kwsexec(kws, data, sz, &kwsm);
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const char *found;
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if (offset == -1)
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break;
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else
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found = data + offset;
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sz -= found - data + kwsm.size[0];
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data = found + kwsm.size[0];
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cnt++;
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}
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}
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return cnt;
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}
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static int has_changes(mmfile_t *one, mmfile_t *two,
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struct diff_options *o,
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regex_t *regexp, kwset_t kws)
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{
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if (!one)
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return contains(two, o, regexp, kws) != 0;
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if (!two)
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return contains(one, o, regexp, kws) != 0;
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return contains(one, o, regexp, kws) != contains(two, o, regexp, kws);
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}
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static int pickaxe_match(struct diff_filepair *p, struct diff_options *o,
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regex_t *regexp, kwset_t kws, pickaxe_fn fn)
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{
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struct userdiff_driver *textconv_one = NULL;
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struct userdiff_driver *textconv_two = NULL;
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mmfile_t mf1, mf2;
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int ret;
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if (!o->pickaxe[0])
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return 0;
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/* ignore unmerged */
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if (!DIFF_FILE_VALID(p->one) && !DIFF_FILE_VALID(p->two))
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return 0;
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if (DIFF_OPT_TST(o, ALLOW_TEXTCONV)) {
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textconv_one = get_textconv(p->one);
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textconv_two = get_textconv(p->two);
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}
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/*
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* If we have an unmodified pair, we know that the count will be the
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* same and don't even have to load the blobs. Unless textconv is in
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* play, _and_ we are using two different textconv filters (e.g.,
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* because a pair is an exact rename with different textconv attributes
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* for each side, which might generate different content).
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*/
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if (textconv_one == textconv_two && diff_unmodified_pair(p))
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return 0;
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mf1.size = fill_textconv(textconv_one, p->one, &mf1.ptr);
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mf2.size = fill_textconv(textconv_two, p->two, &mf2.ptr);
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ret = fn(DIFF_FILE_VALID(p->one) ? &mf1 : NULL,
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DIFF_FILE_VALID(p->two) ? &mf2 : NULL,
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o, regexp, kws);
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if (textconv_one)
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free(mf1.ptr);
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if (textconv_two)
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free(mf2.ptr);
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diff_free_filespec_data(p->one);
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diff_free_filespec_data(p->two);
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return ret;
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}
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static void diffcore_pickaxe_count(struct diff_options *o)
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{
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const char *needle = o->pickaxe;
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int opts = o->pickaxe_opts;
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unsigned long len = strlen(needle);
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regex_t regex, *regexp = NULL;
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kwset_t kws = NULL;
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if (opts & DIFF_PICKAXE_REGEX) {
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int err;
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err = regcomp(®ex, needle, REG_EXTENDED | REG_NEWLINE);
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if (err) {
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/* The POSIX.2 people are surely sick */
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char errbuf[1024];
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regerror(err, ®ex, errbuf, 1024);
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regfree(®ex);
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die("invalid regex: %s", errbuf);
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}
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regexp = ®ex;
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} else {
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kws = kwsalloc(DIFF_OPT_TST(o, PICKAXE_IGNORE_CASE)
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? tolower_trans_tbl : NULL);
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kwsincr(kws, needle, len);
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kwsprep(kws);
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}
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pickaxe(&diff_queued_diff, o, regexp, kws, has_changes);
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if (opts & DIFF_PICKAXE_REGEX)
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regfree(®ex);
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else
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kwsfree(kws);
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return;
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}
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void diffcore_pickaxe(struct diff_options *o)
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{
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/* Might want to warn when both S and G are on; I don't care... */
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if (o->pickaxe_opts & DIFF_PICKAXE_KIND_G)
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diffcore_pickaxe_grep(o);
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else
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diffcore_pickaxe_count(o);
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}
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